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ARCでめちゃモテiOSプログラマー
1.
ARC
iOS (id:ninjinkun / @ninjinkun)
2.
•
Cocoa Touch • ARC • ARC • • ARC • • Tips • GC
3.
Cocoa Touch •
retain / relase -(void)setName:(NSString *)newName { name = [newName retain]; } -(void)dealloc { [name release]; [super dealloc]; 1 3 0 } • Ownership • Ownership retain • Ownership release • 0
4.
Cocoa Touch Autorelase •
• autorelease • release • / •
5.
Cocoa Touch Autorelase •
• autorelease • release • / • -(void)buildNewName { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSMutableArray *array = [[[NSMutableArray alloc] init] autorelease]; [array addObject:@"hoge"]; [array addObject:@"fuga"]; [array addObject:@"piyo"]; name =[array componentsJoinedByString:@","]; [pool drain]; }
6.
ARC •
Automatic Reference Counting • • iOS 5 / Mac OS X 10.7
7.
ARC •
• • (GC) • Static Analyzer
8.
ARC •
@interface NonARCObject : NSObject { NSString *name; } -(id)initWithName:(NSString *)name; @end @implementation NonARCObject -(id)initWithName:(NSString *)newName { self = [super init]; if (self) { name = [newName retain]; } return self; } -(void)dealloc { [name release]; [super dealloc]; } @end
9.
ARC •
@interface ARCObject : NSObject { NSString *name; } -(id)initWithName:(NSString *)name; @end @implementation ARCObject -(id)initWithName:(NSString *)newName { self = [super init]; if (self) { name = newName; } return self; } @end
10.
ARC ARC •
• … • • • •
11.
ARC
__strong • • Ownership • • retain, release -(void)buildNewName { { __strong NSMutableArray *array = [[NSMutableArray alloc] init]; [array addObject:@"hoge"]; [array addObject:@"fuga"]; [array addObject:@"piyo"]; name =[array componentsJoinedByString:@","]; } } !
12.
ARC
__strong • • retain, dealloc relase @interface ARCUser : NSObject { __strong NSString *name; } @end @implementation ARCUser -(id)initWithName:(NSString *)newName { self = [super init]; if (self) { name = newName; // [newName retain] } return self; } -(void)dealloc { // [name release] } @end
13.
ARC
__weak • __weak • • Ownership • nil • • iOS 5 @interface ARCUser : NSObject { __weak id delegate; } @end
14.
ARC
__unsafe_unretainded • • assign • • iOS 4.3 @interface ARCUser : NSObject { __unsafe_unretained id delegate; } @end
15.
ARC
__autoreleasing • autorelase • • @autorelasepool { } -(NSArray *)comvertImageToJpeg:(NSArray *)files { NSMutableArray *dataStore = [NSMutableArray array]; @autoreleasepool { for (NSString *filePath in files) { __autoreleasing UIImage *image = [[UIImage alloc] initWithContentsOfFile:filePath]; NSData *data = UIImageJPEGRepresentation(image, 1.0); [dataStore addObject:data]; } } return [dataStore copy]; }
16.
ARC •
retain, release, autorelase • retainCount • [super dealloc] • dealloc -(void)dealloc { delegate = nil; } • C __bridge NSString *str = @"hogehoge"; CFStringRef strRef = (__bridge CFStringRef)str; CFStringRef strRef = (__bridge_retained CFStringRef)str;
17.
•
ARC __strong • __strong __strong __strong __strong __strong __strong
18.
•
iOS 5 __weak • iOS 4.3 __unsafe_unretaind • nil __strong __weak __strong __strong __strong
19.
ARC •
20.
ARC retain / relase
• -S • • _objc_release() • _objc_retain() • _objc_retainAutoreleasedReturnValue()
21.
ARC __weak •
_objc_storeWeak() • 0 _objc_destroyWeak() • • nil • This document is licensed to ninjin@mac.com.
22.
Blocks •
ARC • self ? • • release • BlocksKit UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; [button addEventHandler:^(id sender) { [self showPhotoPickerView]; } forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button];
23.
Blocks •
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; __unsafe_unretained id _self = self; // !? [button addEventHandler:^(id sender) { [_self showPhotoPickerView]; } forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button];
24.
Blocks •
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; __unsafe_unretained id _self = self; // !? [button addEventHandler:^(id sender) { !? [_self showPhotoPickerView]; } forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button];
25.
Tips ARC •
-fno-objc-arc
26.
Tips ARC •
Static Library • Static Library • Workspace
27.
Tips •
ARC • iOS 5 __weak • Blocks • UI • UI Blocks
28.
GC •
GC • iOS • • • CPU
29.
•
ARC • ( ) • __weak • GC • • ( ) • ARC
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